When the -v command-line option is specified, display simple statistics about the profiling process before terminating: the number of instructions executed, how long it took to trace the program, and the average number of instructions per second.
When the -v command-line option is specified, display simple statistics
about the profiling process before terminating: the number of instructions
executed, how long it took to trace the program, and the average number of
instructions per second.

While I'm here, split up the main() function as it had gotten to long for
my tastes.  Also, remove check of execvp()'s return status; the following
code can only be executed if the new image failed to load.

Approximate time spent: 2 hours.

kbyanc/dyntrace,kbyanc/dyntrace